CATALOGUE. 171 perfect specimens may have enabled those authors to place P. filipes under P. Taliscana with certainty. Dr. Gray, Fl. Cal 1, p. 400, still considers them distinct—Southern Arizona (539) In one specimen, I find three awns to the disk-flowers, which alternate with three scales, each half as long as the achenium. Pectis angustifolia, Torr.—Low, much branched, annual, 1-6' high; leaves slightly connate and bristle-ciliate at base, bearing many oval glands, as also do the scales of the involucre; pappus in both ray- and disk-flowers a mere crown of small and somewhat dentate scales, or in some of the outer flowers of the head of one or two awns, when it is P. fastigiata, Gray (Pl Fendl. p. 62); achenia a little hairy.—A very much dwarfed form of the species, not over half an inch high, is in the collection, obtained by Dr. Loew, probably from New Mexico. Colorado (467). Pectis papposa, Gray.—"Annual, glabrous, diffusely much branched, a span to a foot high, 'lemon-scented': leaves elongated-linear (2-3' long, less than a line wide), furnished with very few bristles at base: heads slender-peduncled, scattered or corymbose, about 20-flowered: scales of the involucre 6-8-linear; rays, elongated, linear-oblong: pappus in the ray a scaly crown, in the disk of 15-20 capillary and very unequal barbellate bristles. Pl. Fendl p. 62." Not having access to satisfactory specimens of the above species, I have been obliged to appropriate the above complete description from Fl. Cal 1, p. 399.—Obtained by the Expedition in Arizona. Pectis tenella, DC.—Low and diffusely branched, smoothish; leaves 1-2' long, nearly a line wide; margins slightly revolute and bearing a few oval glands; rays twice (or nearly so) as long as the scales of the involucre, pappus (ray) a few small scales or rarely with an awn; disk-flowers about 10, two-thirds as long as the ray; pappus (disk) of about 15 very unequal and strongly upwardly barbed bristles; achenia sub-angled and hairy. My specimens do not at all accord with the description in DC. Prod, vol v, p. 99, and I am unable to separate them clearly from the above description of P. papposa Mr. Watson, however, has kindly compared them at Cambridge for me, and I accept his conclusion.—Camp Bowie, Ariz. (446); also obtained by Dr. Loew from Mount TurnbuU, in the same region. Pectis longipes. Gray (Pl. Wright. 2, p. 69).—Annual, diffusely